The tarsometatarsus is a bone that is only found in the lower leg of birds and certain non-avian dinosaurs. It is formed from the fusion of several bones found in other types of animals, and homologous to the mammalian tarsal (ankle) and metatarsal (foot) bones. Despite this, the tarsometatarsus of birds is often referred to as just the tarsus or ...
• (n.) The large bone next the foot in the leg of a bird. It is formed by the union of the distal part of the tarsus with the metatarsus.
(from the article `bird`) ...joint is simplified, there being but two bones involved: the tibiotarsus, consisting of the tibia (the so-called shinbone in man) fused with the ...
Tar`so·met`a·tar'sus noun ; plural Tarsometatarsi . [ New Latin ] (Anat.) The large bone next the foot in the leg of a bird. It is formed by the union of the distal part of the tarsus with the metatarsus. 
the bone underlying the tarsus
a long, single leg element made up foot bones fused fused to one another and to the metarsals, enabling birds to walk on their toes rather than on the whole foot.
The long bone supporting the upper section of the bird foot; the tarsometatarsus is formed by a fusion of the distal tarsals (ankle bones) and the metatarsals (instep bones). Also called simply the metatarsus.